Unreal Engine 6 Targets Open Interoperability Across Game Engines
Epic Games is shifting from a proprietary engine model to an open ecosystem, aiming to make Unreal Engine 6 a standard that other engines can adopt for asset and world interoperability.
Reporting from 1 sources: 4Gamer.net.
In an exclusive interview at Unreal Fest 2026, Epic Games founder Tim Sweeney and engine lead Marcus Wassmer detailed Unreal Engine 6's open specification for interoperability, allowing assets like character cosmetics to move between engines such as Unity and Godot. They compared the vision to web browsers sharing standards and confirmed AI integration via the Model Context Protocol, with no lock-in to any specific language model.
Epic Games' Tim Sweeney and Marcus Wassmer gave 4Gamer the only Japanese media interview at Unreal Fest 2026, held June 16-18 in Chicago. The core of the conversation was Unreal Engine 6's Open Specification for Interoperability, which Sweeney described as a necessary foundation for a true open metaverse. The spec would let assets such as Fortnite cosmetics be described in a format any engine can implement, enabling cross-engine asset exchange without custom pipelines.
Wassmer said Epic hopes Unity and Godot adopt the same specs, and noted that MetaHuman is already available for other engines. Sweeney drew a direct parallel to web browsers: just as Chrome, Safari, and Firefox all access the same servers via web standards, game engines should interoperate on shared specifications. On AI, the team confirmed that Unreal Editor can be controlled by any AI that speaks the Model Context Protocol, whether local or cloud-based, with no preference for a particular LLM.
Synthesized by Yomimono from the 1 cited source below, including Japanese-language reporting where cited, then editorially reviewed before publishing.